Lubricant preparation



Patented Feb. :15, 193

any

poration of (thin No Drag. Appiication November 1%, M235 Serial No. cases a @s. (m. W-

Lubricating oils where subjected to high temperatures on ferrous base surfaces deteriorate quite rapidly. For emcient results therefore, lubricants obviating this have been much desired. We have now found that compositions of oils and certain glycyl oxy-hydrogen compounds present remarkable resistance against such deterioration and afford usage in conditions otherwise not satisfactorily met.

To the accomplishment of the foregoing and related ends, the invention, then, comprises the features hereinafter fully described, and particularly pointed out in the claims, the following description and the contained data setting forth in detail certain illustrative embodiments of the invention, these being indicative however, of but a few of the various ways in which the principle of the invention may be employed.

In accordance with the invention, an oil having lubricating viscosity, and a small proportion of a glycyl compound are mixed together, the latter .compound being of the general formula NR. H2NC.HzC0.R(OH)n, in which R. is a hydrocarbon radical and R(OH)n a polyhydroxy benzene in which there are at least Zhydroxyls and in 1,2 position. The oil may be a petroleum oil of viscosity for instance 48 to 200 Saybolt Universal at 210 F.

Representative of the glycyl compounds are nitrogen-alkyl glycyl polyhydroxy benzenes, nitrogen-cycloparaflin glycyl polyhydroxybenzenes, nitrogen-alkaryl glycyl polyhydroxybenzenes, nitrogen aryl glycyl polyhydroxybenzenes, and for instance nitrogen-o-tolyl-glycyl-1,2-dihydroxybenzene, nitrogen-m-cyclo-glycyl-1,2-dihydroxybenzene, nitrogen-p-isopropyl-phenyl-glycyl-1,2-

dihydroxybenzene, nitrogen-me'thyi-glycyl-1,2-dihydroxybenzene, nitrogen-cyclohexyl-glycyl-1,2-

I droxybenzene, etc.

The glycyl derivative, as indicated, is in quite minor proportion. In general it is unnecessary to exceed 1 per cent thereof in the total'composition, and proportions as low as 0.01 per cent may be employed, depending somewhat upon the oil and the particular duty in view. The glycyl com pounds in such amounts dissolve readily in the oil, and by emcient mixing to attain dissemination, the material is correspondingly prepared without recourse to complicated procedure or interference with desirable refinery practice. K

As an example: With a Mid-Continent neutral lubricating stock having a viscosity of 437 sec. Saybolt Universal at 100 F., there is incorporated 0.01 per cent of nitrogen-para-tolyl-glycyl-1,2- dihydroxybenzene.

As another example: Similary with a stock having lubricating viscosity there is incorporated nitrogen-cyc1ohexyl-glycyl-1,2-dihydroxybenzene.

As another example: Similary with a stock having lubricating viscosity there is incorporated nitrogen-benzyl-glycyl-1,2-dihydroxyben2ene.

Other modes of applying the principle of the invention may be employed, change being made as regards the details described, provided the features stated in any of the following claims, or the quivalent of such, be employed.

We therefore particularly point out and distinctlyclaim as our invention:---

l. A lubricant comprising an oil having lubricating viscosity and a small proportion of a compound of general formula NR.H2NCH2CO.R' (OH) 5 in which R is a hydrocarbon radical and R (0H) 11 a polyhydroixy benzene in which there are at least 2 hydroxyls and in 1,2 position.

2. A lubricant comprising an oil having lubricating viscosity and a small proportion of a nitrogen-alkyl-glycyl-polyhydroxybenzene in which there are at least 2 hydroxyls and in 1,2 position.

3. A lubricant comprising an oil having lubricating viscosity and a small proportion of a nitrogen cycloparaflin glycyl-polyhydroxybenzene in which there are at least 2 hydroxyls and in 1,2

7. A lubricant comprising an oil having lubrieating viscosity and a small proportion of nitrogen-benzyl-glycyl-1,2-dihydroxybenzene.

'JOHN M. MUSSELMAN.

EILIO'I'I' B. MCCONNELL 

